Nonequilibrium conditions in the early Universe are of general interest: their appearance is pre-requisite for the arrow of time dependent processes to take hold. Among the well studied cases is the Big Bang Nucleosynthesis[1]}, [2]}, [3]} appearing in the temperature range \(0.01<T<0.07\,\mathrm {MeV}\) , that is about 1000 times smaller temperature range compared to what will be considered here, \(10< T< 150\)  MeV. Many light isotopes, e.g. deuterium are ashes of this Universe era that are not fully burned. Their relative abundance can be relatively small, just like the case of even greater interest, the origin of non-vanishing baryon number in the Universe.
